We deploy Ms office in Sales OU

1.Admin Tools =>Active Directory Users and Computers

2. Select sales OU and write click => properties =>select 
Group policy object tab
3. Create a new GPO.
4. Click edit to go to Group Policy Editor
5. Computer Config. =>Software Settings => Software 
Installation
6.Write to select new=>package
7.In the Open dialog box
8. give the network path and ok assign.
(for example \\server1\msoffice\proplus.msi)


Install Client System
=====================
Control Panel=> Add Remove Programs (appwiz.cpl)=>Select 
add new programs=> select your Microsoft Ms-office and 
click add button.

Regards
Ramasmay.G